Tail-stock clamp.



G. B. GREBNLEAP & F. s. THOMPSON.

TAIL STOCK CLAMP.

APPLIGATION FILED APR. 5, 191;.

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TAIL STOCK CLAMP.

APPLICATION FILE? APR.5, 1911.

Patented Oct. 17,1911

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UNTTEE STATES PATENT OFFICE GEORGE EDWARD GREENLEAF AND FREDERICK SAMUELTHOMPSON, OF PLAINFIELD, NEW JERSEY, ASSIGNORS TO NILES-BEMENT-PONDCOMPANY, OF JERSEY CITY,

NEW JERSEY.

TAIL-STOCK CLAMP.

To all whom it may concern. 7

Be it known that we, GEORGE EDWARD GREENLEAF and FREDERICK SAMUEL THOMP-soN, citizens of the United States, residing at Plainfield, Unioncounty, New Jersey, have invented certain new and useful Improvements inTail-Stock Clamps, of which the following is a specification.

There is a class of lathes, generally employed for the turning of carwheels while on their axles, in which the tailstock requires a limitedamount of shifting motion on the bed of the lathe, the tailstock havinga substantially invariable working position upon the bed.

The present invention relates to an improved means for clamping thetailstock of such lathes to the lathe-bed.

The invention will be readily understood from the following descriptiontaken in connection with the accompanying drawings in which z- Figure 1is a side elevation of the end of a lathe-bed and of a tailstockprovided with clamping mechanism exemplifying the present invention:Fig. 2 a vertical longitudinal section of the same in the plane of linea Fig. 4: Fig. 3 a vertical longitudinal sec tion in the plane of line bFig. 4: Fig. 4 a vertical transverse section in the plane of line 0Figs. 1, 2 and 5: and Fig. 5 a horizontal section in the plane of line dFigs. 1, 2, 3 and 4.

In the drawings :1, indicates the bed of the lathe: 2, longitudinaltee-slots therein: 3, the tailstock adapted to be shifted endwise of thebed: 4, a bolt depending from each side of the base of the tailstock,these bolts having heads freely engaging the teeslots in the bed: 5,vertical sockets extending down through the top of the bed oneimmediately below each of the bolts when the tailstock is in adjustedworking position upon the bed: 6, a clamping plug vertic'ally movable ineach of the sockets: 7, a tee-slot in the top of each of the plugs inalinement with the tee-slots in the bed: 8, a shaft journaled across thelathe-bed near the plugs: 9, a lever passing through each plug in adirection parallel with the lathe-bed, the plugs being recessed topermit the passage of the levers, and the bodies of the le vers havingupward and downward engagement with the plugs so that the plugs willrise and fall as the levers oscillate 10,

Specification of Letters Patent.

Application filed April 5, 1911.

Patented Oct. 1'7, 1911. Serial No. 619,072.

fixed pivots supported by the bed at the heels of the levers: 11, a pairof eccentrics fast on shaft 8, each of these eccentrics being engaged bythe forked free end of one of the levers: 12, a double-armed lever faston shaft 8: 13, a hand-lever socketed into the double-armed levers: and14, a pair of vertical pedal rods having their lower ends pivoted to theopposite ends of the doublearmed lever.

By operating the hand-lever or the pedals the eccentrics may be turnedto move the plugs up or down. Bolts 4 are to be so adjusted, withreference to the tee-slots in the bed, that they will have no clampingeflect in those slots or interfere with the endwise shifting of thetailstock upon the bed. In a certain position of the eccentrics, theiridle position, the slots in the plugs are in such close alinement withthe slots in the bed that the heads of the bolt-s may pass freely intoand out of the plugs. By shifting the tailstock to working position,which brings the heads of the bolts into the slots of the plugs, and bythen actuating the hand-lever or the pedals the eccentrics may be turnedso as to depress the free ends of the levers and draw the plugsdownward, thereby drawing upon the bolts and clamping the tailstockfirmly to the bed. The clamping of the tailstock or the releasing of it,may be effected in an instant by a simple actuation of the hand-lever orone of the pedals.

It is to be understood that the particular construction set forth ismerely a single exemplification of our invention which manifestly lendsitself to various modifications in detail. For instance, the boltsdepending from the tailstock are simply typical of means for providingthe tailstock with members to be downwardly engaged by clamping devicescarried by the bed of the lathe, and the vertically adjustabletee-slotted plugs with their accessories are simply typical of membersadapted for clamping engagement with the members carried by thetailstock.

We claim 1. A stock clamp comprising, in combination with a lathe bedhaving a vertically movable portion, members carried by the stock forengaging the movable portion of the lathe bed, and means for depressingsaid movable portion.

2. A stock clamp comprising in combination with a lathe bed having avertically movable portion, members carried by the stock for engagingthe movable portion of the lathe bed, means for vertically adjustingsaid members and means for depressing said movable portion. I

3. A tailstock clamp comprising, in combination with a lathe bed havingvertical sockets therein and vertically adjustable plugs in each of saidsockets, members carried by the socket for engaging said plugs, andmeans for vertically adjusting said lugs.

forth.

5. A tailstock clamp comprising, bolts de- 1 pending from the tailstock,sockets in the; lathe-bed adapted to be passed over by said 5 bolts,plugs mounted for vertical adjustment j in said sockets and slotted tohave hooking E engagement with said bolts, a shaft mounted i across thelathe-bed, eccentrics on said shaft, levers pivoted to the lathe-bed andengaging 1 said plugs and eccentrics, and means for turning said shaft,combined substantially as set forth.

6. A tailstock clamp comprising, bolts depending from the tailstock,sockets in the lathe-bed adapted to be passed over by said bolts, plugsmounted for vertical adjustment in said sockets and slotted to havehooking engagement with said bolts, a shaft mounted across thelathe-bed, eccentrics on said shaft, levers pivoted to the lathe-bed andengaging said plugs and eccentrics, and

a lever connected with said shaft to serve in turning it, combinedsubstantially as set forth.

A tailstock clamp comprising, bolts depending from the tailstock,sockets in the lathe-bed adapted to be passed over by said bolts, plugsmounted for vertical adjustment in said sockets and slotted to havehooking engagement with said bolts, a shaft mounted across thelathe-bed, eccentrics on said shaft, levers pivoted to the lathe-bed andengaging said plugs and eccentrics, a lever connected with said shaft toserve in turning it, and pedal mechanism connected with saidlastmentioned lever, combined substantially as set forth.

GEORGE EDWARD GREENLEAF. FREDERICK SAMUEL THOMPSON. WVitnesses:

J. T. MAOMURRAY, C. W. BEITER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, 7 v Washington, D. c.

